Saw-filing machine.



ITO. 772,538. PATENTED OCT. 18,1904.

' M. 1 SGHELL.

SAW FILING MACHINE. APPLIQLTIOII FILED Home, 1903.

N0 MODEL.

UNITE S i atented October is, 1904.

PATENT OFFICE.

- MAX-IMILIAN PAUL. SCHELL, OF s FRANOIscO, CALIFORNIA, ASSIGNOR TO FOLKERS saw FILING MACHINE OO., OFfsAN FRANoIsOO, CALI- YFORNIA. A CORPORATION.

.ISAW-FILIN'G MACHINE.

SPECIFICATION forming part of Letters Patent no. 772,538, dated October 18, 1904'.

' Application filed mast, 1903.: Serial No..l80,370. (NomodeL) To all whom, it may concern: Be it known that I, MAXIMILIAN PAU SOHELL, a citizen of Germany, residing in the city and county of San Francisco and State of .California, have invented new and usefullm provements in Saw-Filing Machines, of which the following is a specification.

My invention relates to improvements in machines for sharpening saws, and particularly in machines of the type employing powerdriven helical file members.

The object of the present invention is to fully described, having reference to'the accompanying drawings, in which Figure l is a side elevation of my machine. v

Fig. 2 is a section taken on line y 3 of Fig. 1. ,Fig. 3 is a plan of the 'filecarriag.e.., Fig. 4

is a detail of the files and feeders.

Y A represents a file-carriage constructed to engage and to slide'on the parallel stationary and elevated tracks 2. The latter are supported rigidly on a suitable .baseh3 by the standards 4:. The helical ,file members 5 are disposed one behind thelother and slightly out of axial alin'e'inent. They are ofopposite pitch and are driven simultaneously in opposite directions to operate upon alternate teeth as the carriage traverses the saw.

Any suitable means to rotate the file members and advance the file-carriage may be employed. I have here shown a hand-wheel 6 journaled in the carriage and transmitting motion to the file "members through the engaging gears 7 and 8.

It is to be noted that the file members are constructed with only a single coil and that I the terminals of acoil donot overlap. The

object of this construction is to avoid the usual angles or V-shaped recesses between successsive coils.. Helical files have ordinarily been constructed with a plurality of. coils, and the cost has consequently been so great in cutting the files, owing to the difficulty in getting into the more or less acute angles between the coils, that the use of filing-machines with filesof this character has been rendered well-nigh im prac-' ticable. I

While it is possible to propel the carriage along the saw by means of the files alone acting on the teeth, it is not practicable to rely on them for that purpose, as it causes undue vibration of the parts, unusual wear on the files, and is liable to cause the file to act un-- The file members and the feeders are re' movable to permit file members being renewed when worn out and topermit both feeders and file members to be removed and replaced by.

others suited to saws of different pitch.

Preferably the file members are placed on the ends of their shafts 10, adjacent to each other, with a-feeder at the outer end of each shaft, whereby the entrance of thefiles to the teeth at one'end and the exit fromthe teeth at the other end of the saw are directed and made gradual. Without these feeders it was found that while the files would do fairly good work in the middle portion of the saw after both files had well engaged the teeth, the action was such at each end of the saw as to cause injury to the teeth. W ith'thisarrangevment of front and rear feeders the forward feeder passes quietly into engagement with the teeth and by the time the files engage is I able to draw the carriage forward at a uniform speed and without undue vibration. Likewise the rearmost feeder becomes a trailer, which maintains engagement with the teeth until after the rear file is pushed olf the end of the saw. Inasmuch as the front feeder travels over unsharpened teeth in advance of its file member, that feeder would be slightly smaller than its file member, while the rearmost feeder or the trailer traveling over the teeth just sharpened by its precedent file member would be of the same size as the latter. It is obvious that each file member could have a feeder on each side of it upon its own shaft.

In order to support the saw relative to the files and to adapt the saw to exert a uniform pressure against the files at all points along the saw and to provide for saws of different sizes being received into the same machine, I employ the following means: A suitable open space is left between and below the tracks for the entrance from either end of a plate 11, which is vertically slotted, as at 12, to receive the bolts 13 of the adjustable clamp-bar 14. The under side of the plate is provided with the downwardly-extending projections 15, which are adapted to seat in sockets in the spring-supported horizontal bar 16, mounted on the bed-plate 3 in line with the open space between the tracks. In practice the saw-support plate 11 is removed from the machine, and the saw to be sharpened is clamped between the plate and the clamp-bar 14, with the row of teeth projecting a given distance above the upper edge of the plate. The plate and saw are then easily inserted into the machine. The springs l7-'beneath bar 16 naturally tend to project the saw-teeth up above the cutting-line of the file members. By advancing the carriage to engage first the forward feeder with the teeth and turning the crank-wheel 6 the feeders act upon the saw to propel the carriage and the files operate to sharpen. the teeth during the traverse of the carriage over the saw.

All ordinary saws when they come from the factory are slightly eonvexed along their cutting edge. By resiliently supporting the saw in the manner herein shown this convexity may be maintained, since the support will give to allow an even pressure to be maintained against the file members from end to end of the saw, and all portions of the saw may thus be cut to a uniform depth. Adjustment will also be made for local inequalities in the teeth, and one interdental space will not be ground deeper than another.

For the purpose of preserving the alinement of the saw-teeth relative to the file members and to keep the teeth up to their work I employ the horizontal guide-rollers 18, journaled in the spring-pressed sliding carriers 19 on the under side of the carriage A. These rollers bear upon opposite sides of the saw in opposition to the file members.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a saw-filing machine, a file-carriage having file-shafts arranged one behind the other, removable blank spiral feeders on the outer ends of the shafts, and removable spiral file members on the shafts intermediate of said blank-feeders, the latter adapted to enter the saw-teeth prior to file members and to leave the saw-teeth subsequent thereto.

2. In a saw-filing machine, the combination of parallel rigid tracks, a file-carriage movable thereon, file members journaled in said carriage, and an adjustable removable springsupported saw-support provided with means for clamping the saw in position.

3. In a saw-filing machine, the combination of parallel rigid tracks, a file-carriage mov able thereon, file members journaled in said carriage, an adjustable removable spring-supported saw-support independent of the carriage-support, and clamping members carried by the support and adapted to clamp the saw between them.

4. In a saw-filing machine, the combination of rigid parallel tracks, a file-carriage movable on said tracks, and an independent sawsupport, the latter comprising removable adjustable clamp members and a resilient seat for said members.

5. In a saw-filing machine, the combination of rigid parallel tracks, a file-carriage and an adjustable removable saw-support, the latter comprising a slotted plate forming one member of a clamp, clamp-bar opposing said plate, a resilient seat for the plate, and means on the plate engaging said seat to hold the plate in position in the machine.

6. In a saw-filing machine, the combination with rigid parallel tracks, a file-carriage movable thereon, file members on said carriage, a saw-support including adjustable clamp members and a resilient seat therefor, and resilientlysupporte :l guides on said carriage to engage the saw-blade in opposition to the file members and steady the blade relative to said file members.

7. In a saw-filing machine, the combination with a file-carriage having rotary file members, and means including clamps and a resilient seat therefor for supporting a saw-blade relative to said members, of opposed adjustable spring-sup 'iorted horizontal roller-guides on said carriage above the clamps and adapted to engage the saw-blade and steady the carriage.

In testimony whereof I have hereunto set my hand in presence of two subscribing \vit nesses.

MAXIIIILIAN PAUL SGIIEIAII.

Witnesses:

S. H. NoUnsn, JESSIE C. BRODIE. 

